Hardware - Software
Special project
Construction of the complete system for automatic control and regulation at plant for production of Anhydride of Maelic Acid based on n-butane, with use of SIEMENS PCS 7 (Process Control System 7 – Totally Integrated Automation)| ArcelorMittal |
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TECHNICAL DESCRIPTION Suggested solution was the replacement of the existing equipment for measurements and regulation, with a new, modern equipment of renowned company. Entire coke plant is conceptualized through following technological units: - coal preparation - coke separation - coking and stations for gas mixing - extractors and pump condensate station - flare stack Coke plant control is done with SIEMENS DCS system PCS 7 v7.0. As controlling processes we used three SIEMENS controllers from S7-400 family, type 417-4H-2DP. Because of the technology process setting, some of technological units are solved autonomous with autonomous controllers from SIMATIC S7-300 family, and the information is forwarded to central system. Those autonomous units and controllers are: coal unloading - CPU 315-2DP, pump station – CPU 315-2DP, position of machines for coke pushing and transfer- 4•CPU 315 2PN/DP. One of the controllers operates with coal preparation and coke separation, while the other two controllers redundantly operate with coke furnaces, station for gas mixing, gas coolers, electro filters, extractors and condensant pump station. Measurements from the flare stack are introduced in controller that controls coke furnaces, and controlling of the tower for coke quenching is realized with the controller that controls coking. Collecting of the measurement and controlling signals is done locally through plant by module type ET200M and with PROFIBUS introduced to process controllers. Because of better reliability and sensitivity reduction of the system to mistakes, PROFIBUS network for measurements supply is realized with redundant ring with optical cable. Visualization and control is constructed in client-server architecture. For servers we used two PCS7 redundant industrial servers, type PRIMERGY RX10054. The servers work parallel and are backup to one another. In case of outage of one of the servers, the system continues to work with the correct server. After returning to the system of incorrect server, automatic data update between servers is done for the period while one of them was not working. The servers are secured by UPS energizing and cooling. Redundant energizing is also secured for process controllers. |